Fafnir® Single Row Ball Screw Support Bearings (MM-BS)

**TIMKEN® Precision Ball Bearings: Fafnir® Single Row Ball Screw Support Bearings (MM BS) – Engineered for Performance and Reliability**

TIMKEN’s **Fafnir® Single Row Ball Screw Support Bearings (MM BS Series)** represent the pinnacle of precision engineering, delivering unmatched performance in demanding industrial, automotive, and high-accuracy machinery applications. Designed to support axial and radial loads in ball screw assemblies, these bearings ensure smooth motion control, reduced friction, and extended service life—critical for applications requiring precision, rigidity, and efficiency.

### **Technical Features & Design Advantages**
The **MM BS series** incorporates advanced materials and precision manufacturing to meet rigorous performance standards:

– **Superior Load Capacity**: Optimized raceway geometry and high-quality steel construction enable high axial and radial load handling, minimizing deflection in precision systems.
– **Low Friction & High Speed**: Precision-ground balls and raceways reduce torque and heat generation, allowing for higher rotational speeds and energy efficiency.
– **Sealed & Lubricated Options**: Available with integrated seals or shields and pre-lubricated with high-performance grease, reducing maintenance and contamination risks.
– **Rigidity & Accuracy**: Tight tolerances (ABEC-1/P0 or higher) ensure consistent performance in CNC machinery, robotics, and other high-precision applications.
– **Corrosion Resistance**: Optional coatings and stainless steel variants enhance durability in harsh environments, including chemical or washdown settings.

### **Performance Benefits**
TIMKEN’s **Fafnir® MM BS bearings** excel where reliability and precision are non-negotiable:
– **Extended Service Life**: Advanced heat treatment and surface finishing reduce wear, even under continuous operation.
– **Reduced System Vibration**: Precision balancing minimizes noise and vibration, critical for sensitive equipment like medical devices or optical systems.
– **Easy Integration**: Standardized dimensions and configurations simplify replacement and installation in existing ball screw assemblies.

### **Typical Applications**
These bearings are engineered for systems requiring precise linear motion and load support:
– **Industrial Machinery**: CNC machine tools, automated guided vehicles (AGVs), and semiconductor manufacturing equipment.
– **Automotive Systems**: Electric power steering (EPS), throttle controls, and transmission actuators.
– **Aerospace & Defense**: Flight control actuators, landing gear systems, and satellite positioning mechanisms.
– **Medical & Robotics**: Surgical robots, imaging devices, and laboratory automation where smooth, backlash-free motion is essential.

### **Why Choose TIMKEN?**
Backed by over a century of bearing expertise, TIMKEN combines rigorous testing, global supply chain reliability, and application-specific engineering support. The **Fafnir® MM BS series** reflects this commitment—delivering precision, durability, and performance for the most challenging mechanical power transmission needs.

For industries where failure is not an option, TIMKEN’s precision ball bearings provide the foundation for innovation and operational excellence.

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Part Number Rows per Set d - Bore D - Outer Diameter Bearing Width Total Width Contact Angle C0 - Static Radial Rating (per row) Ce - Dynamic Radial Rating (per row) Ball Type
MM60BS120 TUM
Triplex
60 mm
120 mm
22.5 mm
67.5 mm
60 º
133400 N
75600 N
STEEL
MM75BS110 TUL
Triplex
75 mm
110 mm
15 mm
45 mm
60 º
77000 N
44500 N
STEEL
MM55BS120 QUH
Quadruplex
55 mm
120 mm
22.5 mm
90 mm
60 º
133400 N
75600 N
STEEL
MM60BS120 QUM
Quadruplex
60 mm
120 mm
22.5 mm
90 mm
60 º
133400 N
75600 N
STEEL
MM75BS110 QUL
Quadruplex
75 mm
110 mm
15 mm
60 mm
60 º
77000 N
44500 N
STEEL
MM55BS120 SUM
Single
55 mm
120 mm
22.5 mm
22.5 mm
60 º
133400 N
75600 N
STEEL
MM60BS120 SUL
Single
60 mm
120 mm
22.5 mm
22.5 mm
60 º
133400 N
75600 N
STEEL
MM100BS150 SUH
Single
100 mm
150 mm
22.5 mm
22.5 mm
60 º
200500 N
80900 N
STEEL
MM50BS90 DUL
Duplex
50 mm
90 mm
15 mm
30 mm
60 º
60900 N
41400 N
STEEL
MM55BS90 DUH
Duplex
55 mm
90 mm
15 mm
30 mm
60 º
60900 N
41400 N
STEEL
MM50BS90 TUL
Triplex
50 mm
90 mm
15 mm
45 mm
60 º
60900 N
41400 N
STEEL
MM55BS90 TUH
Triplex
55 mm
90 mm
15 mm
45 mm
60 º
60900 N
41400 N
STEEL
MM50BS90 QUL
Quadruplex
50 mm
90 mm
15 mm
60 mm
60 º
60900 N
41400 N
STEEL
MM55BS90 QUH
Quadruplex
55 mm
90 mm
15 mm
60 mm
60 º
60900 N
41400 N
STEEL
MM45BS100 SUL
Single
45 mm
100 mm
22.5 mm
22.5 mm
60 º
93400 N
71200 N
STEEL
MM50BS100 SUH
Single
50 mm
100 mm
22.5 mm
22.5 mm
60 º
93400 N
71200 N
STEEL
MM55BS90 SUM
Single
55 mm
90 mm
15 mm
15 mm
60 º
60900 N
41400 N
STEEL
MM45BS100 DUL
Duplex
45 mm
100 mm
22.5 mm
45 mm
60 º
93400 N
71200 N
STEEL
MM50BS100 DUH
Duplex
50 mm
100 mm
22.5 mm
45 mm
60 º
93400 N
71200 N
STEEL
MM55BS90 DUM
Duplex
55 mm
90 mm
15 mm
30 mm
60 º
60900 N
41400 N
STEEL